xref: /linux/include/net/sock_reuseport.h (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SOCK_REUSEPORT_H
3 #define _SOCK_REUSEPORT_H
4 
5 #include <linux/filter.h>
6 #include <linux/skbuff.h>
7 #include <linux/types.h>
8 #include <linux/spinlock.h>
9 #include <net/sock.h>
10 
11 extern spinlock_t reuseport_lock;
12 
13 struct sock_reuseport {
14 	struct rcu_head		rcu;
15 
16 	u16			max_socks;		/* length of socks */
17 	u16			num_socks;		/* elements in socks */
18 	u16			num_closed_socks;	/* closed elements in socks */
19 	u16			incoming_cpu;
20 	/* The last synq overflow event timestamp of this
21 	 * reuse->socks[] group.
22 	 */
23 	unsigned int		synq_overflow_ts;
24 	/* ID stays the same even after the size of socks[] grows. */
25 	unsigned int		reuseport_id;
26 	unsigned int		bind_inany:1;
27 	unsigned int		has_conns:1;
28 	struct bpf_prog __rcu	*prog;		/* optional BPF sock selector */
29 	struct sock		*socks[] __counted_by(max_socks);
30 };
31 
32 extern int reuseport_alloc(struct sock *sk, bool bind_inany);
33 extern int reuseport_add_sock(struct sock *sk, struct sock *sk2,
34 			      bool bind_inany);
35 extern void reuseport_detach_sock(struct sock *sk);
36 void reuseport_stop_listen_sock(struct sock *sk);
37 extern struct sock *reuseport_select_sock(struct sock *sk,
38 					  u32 hash,
39 					  struct sk_buff *skb,
40 					  int hdr_len);
41 struct sock *reuseport_migrate_sock(struct sock *sk,
42 				    struct sock *migrating_sk,
43 				    struct sk_buff *skb);
44 extern int reuseport_attach_prog(struct sock *sk, struct bpf_prog *prog);
45 extern int reuseport_detach_prog(struct sock *sk);
46 
47 static inline bool reuseport_has_conns(struct sock *sk)
48 {
49 	struct sock_reuseport *reuse;
50 	bool ret = false;
51 
52 	rcu_read_lock();
53 	reuse = rcu_dereference(sk->sk_reuseport_cb);
54 	if (reuse && reuse->has_conns)
55 		ret = true;
56 	rcu_read_unlock();
57 
58 	return ret;
59 }
60 
61 void reuseport_has_conns_set(struct sock *sk);
62 void reuseport_update_incoming_cpu(struct sock *sk, int val);
63 
64 #endif  /* _SOCK_REUSEPORT_H */
65